Mechanism of electro-generative-leaching of chalcopyrite-MnO2 in presence of Acidithiobacillus ferrooxidans

肖利; 方正; 邱冠周; 王少芬; 王春雄

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Mechanism of electro-generative-leaching of chalcopyrite-MnO2 in presence of Acidithiobacillus ferrooxidans

机译：酸性硫代氧化亚铁细菌存在下黄铜矿-MnO2的发电浸出机理

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To clarify the role and mechanism of Acidithiobacillus ferrooxidans (A. ferrooxidans) in bio-electro-generative-leaching (BEGL), an experiment was made on the electro-generative leaching of chalcopyrite-MnO2 in the presence of the bacteria which grew respectively in Fe(Ⅱ) and S0 media. A dual cell system with chalcopyrite anode and MnO2 cathode was used to study the relationship between time and both of electric quantity and dissolved rate of the two minerals in BEGL. The results show that the dissolved rates for Cu2+ and Fe2+ under the action of the bacteria cultivated by S0 medium are almost 2 times faster than those by Fe(Ⅱ). And the leaching ratio for Mn2+ and the electric output increase by near 3 times. The oxidation residue of chalcopyrite was characterized by SEM and XRD, whose patterns are similar to those of raw ore in BEGL. The mechanism of anodic reaction for CuFeS2-MnO2 leaching in the presence of A. ferrooxidans cultivated by S0 medium is proposed as a successive reaction of two independent sub-processes. The first stage is the dissolution of chalcopyrite to produce Cu2+, Fe2+ and sulfur, and the second stage is bio-oxidation of sulfur, which is the control step of the process. However, dissolution of MnO2 lasts until the reaction of chalcopyrite stops or the ores exhaust in two types of leaching.

机译：为了阐明酸性硫杆菌铁氧化蛋白（A. ferrooxidans）在生物发电浸出（BEGL）中的作用和机理，在黄铜矿-MnO2分别存在的条件下，对黄铜矿-MnO2进行了发电浸出实验。 Fe（Ⅱ）和S0介质。用黄铜矿阳极和MnO2阴极的双电池系统研究了时间与BEGL中两种矿物的电量和溶解速率之间的关系。结果表明，在S0培养基培养的细菌的作用下，Cu2 +和Fe2 +的溶解速率几乎是Fe（Ⅱ）的2倍。 Mn2 +的浸出率和电输出增加了近3倍。通过SEM和XRD对黄铜矿的氧化残渣进行表征，其形态与BEGL中的原矿相似。作为两个独立的子过程的连续反应，提出了在S0培养基培养的铁氧化拟南芥存在下，CuFeS2-MnO2浸出的阳极反应机理。第一阶段是黄铜矿的溶解以生成Cu2 +，Fe2 +和硫，第二阶段是硫的生物氧化，这是该过程的控制步骤。然而，MnO2的溶解持续到黄铜矿的反应停止或矿石以两种浸出方式排出为止。

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《中国有色金属学报：英文版》 |2010年第S1期|P.15-20|共6页
作者
肖利; 方正; 邱冠周; 王少芬; 王春雄;
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School of Chemistry and Chemical Engineering, Central South University;

School of Resources Processing and Bioengineering, Central South University;

College of Chemistry and Biological Engineering, Changsha University of Science and Technology;

College of Metallurgic Engineering, Hunan Un iversity of Technology;

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Mechanism of electro-generative-leaching of chalcopyrite-MnO2 in presence of Acidithiobacillus ferrooxidans

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